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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0952100 (1978-10-17) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 32 인용 특허 : 0 |
A set of hinged covers adapted to sealably close the rectangular hatch on the roof of a railway hopper car having a coaming running along the hatch perimeter. Each cover has a vaulted formation to shed water, the long edges of the cover being rolled to define canopies which protectively shield the c
A set of at least two light-weight covers of high strength and rigidity adapted to sealably close a rectangular hatch in the wall of a structure such as a railway hopper car having a walkway on each side of the hatch, said hatch having a coaming running along its perimeter, each cover closing a resp
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